Mr. Pen L-Shape Carpentry Square, 8-Inch x 12-Inch

Last updated date: October 12, 2021

DWYM Score

9.2

Mr. Pen L-Shape Carpentry Square, 8-Inch x 12-Inch

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We looked at the top Carpentry Squares and dug through the reviews from some of the most popular review sites. Through this analysis, we've determined the best Carpentry Square you should buy.

Update as October 12, 2021:
Checkout The Best Carpentry Squares for a detailed review of all the top carpentry squares.

Overall Take

Here is the perfect black framer ruler made from anti-rust carbon steel, with one leg measuring 8 inches by 6.5 inches, the other at 12 inches by 11 inches. It also offers metric measurements and high-contrast markings for visibility.


In our analysis, the Mr. Pen Mr. Pen L-Shape Carpentry Square, 8-Inch x 12-Inch placed 4th when we looked at the top 6 products in the category. For the full ranking, see below.

From The Manufacturer

Black Framing Ruler, The Shorter Leg Measures At 8 Inch Outside And 6.5 Inch Inside – Longer Leg Measures At 12 Inch Outside And 11 Inch Inside. This L Ruler Includes Imperial Units On One Side With 1/16-Inch Graduations And Metric Units On The Other Side With mm Graduation. Easy To Read Markings With Bright White On Black Design. High-Quality L-Ruler, Carbon Steel Material – Sturdy And Durable Against Rusting. Ideal For Carpentry Applications In Framing, Roofing, Stair Work, In Making Layouts And Patterns - Can Also Be Used As Straightedge For Determining Flatness Of A Surface.

An Overview On Carpentry Squares

Carpentry squares are a great tool for anyone who needs to lay out and mark patterns in frames, stairways and roofs. They can also be used as straightedges to determine how linear and flat surfaces are.

These tools are also referred to as rafter squares, roofing squares and flat squares. You can find carpentry squares that are designed to fit in your pocket and ones that are made to work with different surfaces such as wood or brick.

They are generally made from aluminum or steel and are shaped like the letter “L.” Though the standard size is 24 inches by 16 inches, they can also be found in other sizes. The longer part is called the blade, and the shorter part is the tongue; these join at the heel.

You’ll find many different types of squares, often specialized for certain jobs. A combination square, for example, can mark lines at 45 degrees, 90 degrees and 135 degrees and includes an adjustable slide ruler. Tri-squares do not have the adjustable rule, so they look like flat steel blades that are riveted at 90° to wooden handles. Drywall squares, speed squares, and many others also exist.

The measuring dimensions are stamped onto the surface and vary by the purpose the tool is designed for. Most carpentry squares are calibrated in inches and fractions of inches; look for ones that are clearly stamped and easy to read.

The Carpentry Square Buying Guide

  • If you work outside, shop for carpentry squares with anti-glare coatings.
  • Aluminum is water-resistant and does not rust like steel.
  • Some of these squares come with accessories, like manuals that can instruct you on how to use them properly.
  • Some squares are multi-use tools that include the square along with many other useful parts. These can be very convenient and save you money.